Moar, P., & Mayes, W. (1946). Notes: (2) A Small Hoard of Polished Stone Knives and a Polished Stone Adze from the Ward of Shurton, near Lerwick. Proceedings of the Society of Antiquaries of Scotland, 80, 140-141. Retrieved from http://journals.socantscot.org/index.php/psas/article/view/8258